.li {
  height: 40px;
  line-height: 40px;
  background: #f2f2f2;
  border-bottom: 1px solid #ffffff;
}

.icon-triangle {
  display: inline-block;
  border: 7px solid transparent;
  border-bottom-color: #ccc;
  transform: rotate(90deg);
}
.rotate {
  transform: rotate(180deg);
  transition: all 0.5s;
  position: relative;
  top: 5px;
  right: 5px;
}
.rotateFalse {
  transform: rotate(90deg);
  transition: all 0.2s;
}
